Shenglong Zhang created KAFKA-14808:
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Summary: Partition becomes leaderless when new partition
reassignment removes the adding replica
Key: KAFKA-14808
URL: https://issues.apache.org/jira/browse/KAFKA-14808
Project: Kafka
Issue Type: Bug
Components: controller
Affects Versions: 3.4.0
Reporter: Shenglong Zhang
If there is ongoing partition reassignment and any adding replica has been
elected as leader (due to preferred leader election or other reason), the
partition will immediately becomes leaderless on receiving a new partition
reassignment which removes that adding replica.
1) partition-0 has replicas [0, 2]
2) partition-0 is being reassigned to [1, 0, 2], and somehow this reassignment
is stuck (e.g. broker 2 is down).
3) Preferred leader election is triggered, and broker 1 is elected as leader.
4) When submitting a new partition reassignment to [2, 0, 3], which remove
broker 1 and add broker 3, partition will become leaderless.
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